"Collect all people in a circle; you might want to start with a moment of mindfulness (try e.g. the app Insight Timer and chose one of the shorter guided meditations)."
I meditate and even use that specific app, though only as a timer... and I still would never impose a guided meditation on visitors to my home who are there to work.
It borders on religious proselytizing.
"A good one to start a Hoffice day is e.g. 'Being Infinite'."
I don't know anything about the content of that, but I have a hard time seeing how it would be appropriate for a secular, professional gettogether of strangers from different backgrounds.
If I went to a Hoffice thing and the host put on a guided meditation about "being infinite," I would maybe join because sitting quietly for a while is nice... but I wouldn't come back. If I want to meditate on infinity, I'll go to a temple, or sit on my bench at home, thank you.